The color buff is a fleshy tone. It is a very light beige color. There are many variations and interpretations of the color buff. From a nude beige to a buttery or pinkish beige, all these colors can be called buff.
1 Additional Answer
Buff is a pale, yellowish brown color. It is related to the tan group and is often times considered an earth tone. It is popular on walls because it's neutral, but still adds color without being too vibrant.